From c6f254f864286dd85fbcb225e6635d0b73b6cea0 Mon Sep 17 00:00:00 2001
From: wangdl <wangdl@longde.cloud>
Date: Mon, 8 Jun 2026 21:14:58 +0800
Subject: [PATCH] fix: add completed/interrupted guard in session upsert
 (out-of-order event defense)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 src/modules/learning-session/learning-session.repository.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/modules/learning-session/learning-session.repository.ts b/src/modules/learning-session/learning-session.repository.ts
index d0deb47..cb594d9 100644
--- a/src/modules/learning-session/learning-session.repository.ts
+++ b/src/modules/learning-session/learning-session.repository.ts
@@ -80,6 +80,11 @@ export class LearningSessionRepository {
     });
 
     if (existing) {
+      // Guard: don't update completed/interrupted sessions (defense against out-of-order events)
+      if (existing.status === 'completed' || existing.status === 'interrupted') {
+        return existing;
+      }
+
       const update: any = {
         lastEventAt: new Date(Number(data.timestampMs)),
       };